Animemes

Unless OP's definition of 'modern' is from, at least, the 1500s till now...

You've heard of "Free Hugs"....

You've heard of "Free Shrugs"....

Now get ready for:

if you show up unshowered and without deodorant ata fucking con and im near you i will puke all over you.

There is a distinct difference between the smell of freshly generated sweat, and dried sweat mixed with all of the other accumulated filth one accrues when they don’t regularly shower.

The first time I went to pax, the whole convention stank like stale pizza. Like at a mall next to a Sbarro's. Problem was, there was no food court or restaurants at pax... It's all the greasy gamer stink.

But they did their own research! /s

Yeah, there's a reason they aren't scientists. Like, who tf quotes a Future Proof video unironically. They are the idiot's idea of an intelligent video.

People have been cleaning themselves for essentially forever. Bathing was not as common as it is today, but we know people have been washing their hands, feet and face regularly for many thousands of years.
Cleanliness features very heavily in religion dating back thousands of years, and the earliest soap recipe is from ~2500BC, although we know they were making at scale hundreds of years before then.
Wells to make water available in places where there's no stream or river date back even further to the ~8000s BC.

Most people weren't rocking perfumed soaps and immersion in hot water, but washing your clothes with a homemade soap, scrubbing your feet, hands and face with cold water and a rag every day or so and likewise your body roughly weekly was available to most people at a minimum. If you were near a river or body of water, like humans tend to prefer to live, washing your feet, hands and face every morning and a weekly scrub was perfectly comfortable.

Primates are generally very conscious of grooming. Humans are unique in regularly washing with water, but we're also unique in being nearly hairless, remarkably greasy, and clever. It tracks that we'd figure out the water thing pretty fast.

I don’t know, bad smells are not filtered for an evolutionary reason. Sure you work at a bakery and the amazing smell of bread is filtered by day 2 never to be smelled again, but i had to bunk under a mfkr in the military who was under shower supervision, and yet still had a mark on him from that time someone dropped an alcohol pad on his arm. My brain didn’t filter shit, as in the smell of.